Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) - Change in Accumulated OCI (Details)

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Accumulated Other Comprehensive Income (Loss) - Change in Accumulated OCI (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     $ 243,471 $ 232,685
Net change $ (2,223) $ 2,326 (870) 3,746
Ending Balance 251,659 237,411 251,659 237,411
Derivatives        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (1,661) (2,277)
Net change     289 215
Ending Balance (1,372) (2,062) (1,372) (2,062)
Employee Benefit Plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (3,350) (2,407)
Net change     50 56
Ending Balance (3,300) (2,351) (3,300) (2,351)
Foreign currency        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (669) (512)
Net change     (8) (119)
Ending Balance (677) (631) (677) (631)
Total        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (4,320) (8,457)
Net change     (870) 3,746
Ending Balance (5,190) (4,711) (5,190) (4,711)
Debt securities | Available-for-sale debt securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     1,343 (3,257)
Net change     (1,249) 3,612
Ending Balance 94 355 94 355
Equity securities | Available-for-sale debt securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     17 (4)
Net change     48 (18)
Ending Balance $ 65 $ (22) $ 65 $ (22)